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4 insert into user_info( username, password ) 5 values( 'user'||i, 'password'||i ); 6 end loop; 7 end; 8 / PL/SQL procedure successfully completed. benchmark@ORA10G> select username, password from user_info; USERNAME PASSWORD --------------- --------------user1 password1 user2 password2 user3 password3 user4 password4 user5 password5 user6 password6 user7 password7 user8 password8 user9 password9 user10 password10 Let s now look at DemoSQLInjection, a program that authenticates an application user by validating the combination of username and password input from the command line against table user_info s data. The usage of the program is java DemoSQLInjection <bind|nobind> <username> <password> The program takes three parameters from the command line. The first parameter can have two possible values: bind or nobind. If we give an option of nobind, the program verifies the username and password without using bind variables; otherwise, it does so using bind variables. The second parameter is the username, and the third parameter is the password. The class listing begins with import statements and declaration of the main() method: /* This program demonstrates how using bind variables can prevent SQL injection attacks. * COMPATIBLITY NOTE: runs successfully against 9.2.0.1.0 and 10.1.0.2.0. */ import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.Statement; import java.sql.ResultSet; import java.sql.Connection; import book.util.JDBCUtil; class DemoSQLInjection { public static void main(String args[]) {
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Inside main(), we invoke _validateProgramInputs() (defined later), which performs simple input validation and prints program usage if required. We then store the three command-line parameters in string variables: _validateProgramInputs( args ); String selectedOption = args[0]; String username = args[1]; String password = args[2]; The next step is to get the database connection within the try catch block. Connection conn = null; try { // get connection conn = JDBCUtil.getConnection("benchmark", "benchmark", "ora10g"); If the first parameter is nobind, we invoke the method _authenticateWithoutUsingBind Values(), which performs the authentication without using bind variables. Otherwise, it invokes _authenticateUsingBindValues(), which validates the username and password using bind variables. We end the main() method with the usual catch and finally clauses: if( NO_BIND.equals( selectedOption ) ) { _authenticateWithoutUsingBindValues( conn, selectedOption, username, password ); } else { _authenticateUsingBindValues( conn, selectedOption, username, password ); } } catch (SQLException e) { // handle the exception properly - in this case, we just // print a message and roll back JDBCUtil.printExceptionAndRollback( conn, e ); } finally { // release JDBC resources in the finally clause. JDBCUtil.close( conn ); } } The definition of _authenticateWithoutUsingBindValues() follows. The main point to note is that the query statement string is computed by concatenating the input username and password to the query string. We use the Statement class to emphasize that we are not using bind variables in this case.
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// authenticate without using bind values private static void _authenticateWithoutUsingBindValues( Connection conn, String selectedOption, String username, String password ) throws SQLException { Statement stmt = null; ResultSet rset = null; try { stmt = conn.createStatement(); String verifyStmtString = "select count(*) from user_info " + "where username = '" + username + "'" + " and password = '" + password + "'"; System.out.println("verify statement: " + verifyStmtString ); We execute the query next. If we find no records matching the input username and password, we print a message indicating that the authentication failed. Otherwise, authentication succeeds and a message to that effect is printed: rset = stmt.executeQuery( verifyStmtString ); while( rset.next() ) { int count = rset.getInt(1); if( count == 0 ) System.out.println("Invalid username and password - access denied!"); else System.out.println("Congratulations! You have been " + "authenticated successfully!"); } } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( stmt ); } } The following method, authenticateUsingBindValues(), also executes the same select statement, except this time we use a PreparedStatement object and bind our input parameter values: private static void _authenticateUsingBindValues( Connection conn, String selectedOption, String username, String password ) throws SQLException { PreparedStatement pstmt = null; ResultSet rset = null; try {
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